Q: In this task, you are given an article. Your task is to summarize the article in a sentence.
A suicide bomber detonated a vehicle in Sadr City, targeting a busy street full of garages and used-car dealers.
At least 42 people were also wounded in the attack, which was claimed by the Islamic State group.
Baghdad saw a wave of deadly suicide attacks in the first few days of 2017, but the number has dropped recently.
The IS group has stepped up its attacks since the Iraqi army, aided by US-led coalition strikes, launched its campaign to dislodge the group from its stronghold of Mosul in the north four months ago.
Wednesday's attack targeted the Habibya area of Sadr City, north of the centre of the Iraqi capital, an interior ministry official told AFP.
The blast follows a car bomb attack in southern Baghdad on Tuesday that killed four people.
On 2 January, 35 people were killed in a bomb blast in Sadr City, in an attack claimed by IS.
Iraq's capital has also been hit by violent protests in recent days by supporters of Shia cleric Moqtada al-Sadr, who are demanding changes to the electoral commission that oversees elections.
At least six people were killed in clashes with police on Sunday.
A:
At least 18 people have been killed in a bomb attack on a predominantly Shia suburb of the Iraqi capital Baghdad, security sources say.